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mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation available in lead free packaging precision adjustable shunt regulator spx1431 description features trimmed bandgap reference to 0.4% wide operating current 1ma to 150ma extended temperature range: -55 c to 125 c low temperature coefficient 30 ppm/ c offered in to-92, soic, sot-89, sot-23-5 improved replacement in performance for lt1431 low cost solution the spx1431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. the spx1431 acts as an open-loop error amplifier with a 2.5v temperature compensation reference. the spx1431's thermal stability, wide operating current (150ma) and temperature range (-55 c to 125 c) makes it suitable for a variety of applications that require a low cost, high performance solution. spx1431 tolerance of 0.4% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly lines and contributes a significant cost savings. the output voltage may be adjusted to any value between v ref and 36 volts with two external resistors. the spx1431 is available in to-92, soic-8, sot-89, and sot-23-5 packages. block diagram + - 2.5v reference (r) anode (a) cathode (k) applications battery operating equipment adjustable supplies switching power supplies error amplifiers single supply amplifier monitors / vcrs / tvs personal computers now available in lead free packaging 1 2 3 4 5 6 7 8 anode cathode n/c ref anode anode anode n/c spx1431 8 pin nsoic
2 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation absolute maximum ratings cathode-anode reverse breakdown v ka ....................................... 37v anode-cathode forward current, (<10ms) i ak ................................. 1a operating cathode current i ka .................................................. 150ma reference input current i ref ........................................................ 10ma continuous power dissipation at 25 c p d to-92 ..................................................................... 775mw sot-23 .................................................................. 200 mw soic-8 .................................................................... 750mw sot-89 ................................................................. 1000mw junction temperature t j ........................................................... 150 c storage temperature t stg .............................................. -65 to 150 c note: stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating condi- tions for extended periods may affect reliability. typical thermal resistances package 0 ja 0 jc typical derating to-92 160 c/w 80 c/w 6.3 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c soic-8 175 c/w 45 c/w 5.7 mw/ c sot-89 110 c/w 8 c/w 9.1mw/c typical deratings of the thermal resistances are given for ambient temperature >25 c. electrical characteristics at 25 c i k = 10ma v k = v ref , unless otherwise specified. parameter symbol figure conditions min typ max units spx1431 reference voltage v ref 2 2.490 2.500 2.510 v 2 t j = 0 c to 105 c 2.465 2.535 v 6 v ref withtemp.* tc 2 0.07 0.20 mv/ c ratio of change in v ref 6 v ref 3 v k = 3v to 36v -2.0 -1.1 mv/v to cathode voltage 6 v k reference input current i ref 3 0.7 1.9 a i ref temp deviation 6 i ref 3 t j = 0 c to 105 c 0.4 1.2 a min i k for regulation i k(min) 2 0.4 1 ma off state leakage i k(off) 4 v ref = 0v, 0.04 250 na v ka = 36v dynamic output z ka 2 ? z ) 1khz 0.15 0.5 1 impedance i k = 1 to 150ma operating range (t j ) = - 55 c to 125 c. * see appropiate test circuit (figure 2) recommended conditions parameter symbol rating unit cathode voltage v ka v ref to 36 v cathode current i k 10 ma electrical characteristics
3 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation 6 t 6 v ref 0 15 30 45 60 75 90 105 -10 0.5 5000 00 0 0.07 mv/ c 0.003 %/ c 27 ppm/ c ppm % mv junction temperature ( c) ? tc in ppm/ c = ? tc in %/ c = ? tc in mv/ c = 6 v ref (mv) 6 t a ( 6 v ref at 25 c ) 6 t a 6 v ref x 100 ( 6 v ref at 25 c ) 6 t a 6 v ref x 10 6 calculating average temperature coefficient (tc) figure 1. v ref vs temperature. test circuits i ref v ka = v ref v in i k i ref v ka v in i k (v ref ) r1 r2 v ka v in i k (off) figure 2. test circuit for v ka = v ref figure 3. test circuit for v ka > v ref figure 4. test circuit for i koff
4 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation -2 -1 0 1 2 3 150 125 100 75 50 25 0 -25 -50 -75 -100 v ka cathode voltage (v) i k cathode current (ma) v ka = v ref 0 c to 105 c -60 -30 0 30 60 90 120 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.45 t a ambient temperature ( c) v ref reference voltage (v) v ka = v ref i k = 10ma figure 5. high current operating characteristics figure 6. reference voltage vs ambient tempetature -1.0 0 1.0 2.0 3.0 900 800 700 600 500 400 300 200 100 0 -100 -200 v ka cathode voltage (v) i k cathode current ( a) v ka = v ref 0 to 105 c 105 c 25 c -0 c -60 -30 0 30 60 90 120 3.0 2.5 2.0 1.5 1.0 0.5 0 t a ambient temperature ( c) i ref reference input current ( a) r1 = 10k 1 r2 = ' i k = 10ma figure 7. low current operating characteristics figure 8. reference input current vs ambient temperature 0 3 6 9 12 15 18 21 24 27 30 0 -10 -20 -30 -40 -50 v ka cathode voltage (v) 6 v ref (mv) 0 c 25 c 75 c 125 c i ka = 10ma figure 9. reference voltage line regulation vs cathode voltage and t ambient 10 100 1k 10k 100k 70 60 50 40 30 20 10 0 f frequency (hz) noise voltage nv 3 hz v ka = v ref i k = 10ma t a = 25 c figure 10. noise voltage vs frequency typical performance characteristics
mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation -60 -30 0 30 60 90 120 0.150 0.125 0.100 0.075 0.050 0.025 0.0 t a free air temperature z ka dynamic impedance ( 1 ) v ka = v ref i k = 1 to 100ma f ) 1khz figure 11. low frequency dynamic output impedance vs t ambient 10 100 1k 10k 100k 1m 10m start 10.000hz stop 50 000 000.000hz ref level 60.000db 0.0deg /div 10.000db 45.000deg marker 19 422 mag (a/r) marker 19 422 phase (a/r) 611.000hz -0.125db 611.000hz 46.717deg phase gain figure 12. small signal gain and phase vs frequency; i k = 10ma, t a = 25 c i k v in 9 f 15k 1 8.25k 1 v out gnd 230 1 figure 13. test circuit for gain and phase frequency response figure 14. frequency = 100khz, i k = 10ma, t a = 25 c figure 15. test circuit for pulse response figure 16. stability boundary conditions i k v out gnd 250 1 50 1 v in f p = 100khz 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 100 90 80 70 60 50 40 30 20 10 0 c l load capacitance (pf) i k cathode current (ma) a: v ka = v ref b: v ka = 5v at i k =10ma c: v ka =10v at i k =10ma d: v ka =15v at i k =10ma c d b a stable stable t a = 25 c v out v in v out v in typical performance characteristics
mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation figure 17. test circuit for stability figure 18. dynamic output impedance t a = 25 c, i k = 1 to 100ma figure 19. off state leakage figure 20. shunt regulator v out = (1+r1/r2)v ref 150 1 10k 1 i k c l r 0.01 0.1 1 10 100 -50 0 50 100 150 t a ambient temperature ( c) i koff cathode current (na) v ka = 36v v ref = 0v t a = 25 c i k = 1ma to 100ma z ka - dynamic f - frequency (hz) 100 10 1.0 0.1 0.01 1k 10k 100k 1m 10m r2 0.1% v in r3 r1 0.1% v out v ref spx1431 figure 21. constant current, sink, i sink = v ref /r1 figure 22. reference amplifier for isolated feedback in off-line dc-dc converters q1 v in r2 r1 0.1% i sink spx1431 r2 0.1% r3 r1 0.1% v out spx1431 c2 c1 isolated feedback v out rtn + r3 sets feedback gain, c1 provides feedback compensation opto isolator typical performance characteristics
7 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation figure 23. precision high current series regulator v out = (1+r1/r2)v ref figure 24. high current shunt regulator v out = (1+r1/r2)v ref figure 25. single supply comparator with temperature compensated threshold. v in threshold = 2.5v v in r1 0.1% spx1431 r3 r2 0.1% c1 r5 r4 v out v in r1 0.1% spx1431 r3 r2 0.1% q1 v out v cc r2 spx1431 v in v out r1 * resistor values are chosen such that the effect to i ref is negligible . typical performance characteristics sot-23-5 (m5) 3 21 top view 5 4 top view sot-89 (m1) 1 2 3 bottom view to-92 (n) 1 32 n/c ref anode cathode cathode anode ref top view 2 1 3 4 8 7 6 5 8-pin surface mount (s) cathode ref anode anode anode anode n/c n/c n/c cathode anode ref package pinouts
mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation package: 8 pin nsoic
mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation package: 5 p in sot-23
0 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation package: 3 p in sot-89
mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation package: 3 p in to-92
2 mar3-07 spx43 precision adjustable shunt regulator ? 2007 sipex corporation ordering informa tion sipex corporation headquarters and sales offce 233 south hillview drive milpitas, ca 03 tel: (40) 34-700 fax: (40 ) 3-700 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. solved by tm part number package code rohs status pack quantity spx43m sot- -3 active bulk spx43m/tr sot- -3 active 2 00 tape & reel spx43m-l sot- -3 ? active bulk spx43m-l/tr sot- -3 ? active 2 00 tape & reel spx43m sot-23- eol bulk spx43m/tr sot-23- eol 2 00 tape & reel spx43m-l sot-23- ? eol bulk spx43m-l/tr sot-23- ? eol 2 00 tape & reel spx43n to- 2 eol bulk spx43n/tr to- 2 obs 2000 tape & reel spx43n-l to- 2 ? eol bulk spx43n-l/tr to- 2 ? eol 2000 tape & reel spx43s nsoic eol bulk spx43s/tr nsoic eol 2 00 tape & reel spx43s-l nsoic ? eol bulk spx43s-l/tr nsoic ? eol 2 00 tape & reel

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